What sort of maths is this?

I have a number n

I increase n. I now have a new number n+1

I change my mind and decrease n: I now have a new number n-1

I change my mind again and increase. I am now back to n+1

No matter what I do along the above lines by increasing and decreasing, I can't get back to n.

What am I doing?

Clue

The answer may be nearer than you think

• @chaslyfromUK Does increasing twice in a row count as performing the same set of operations to return to $n$? Mar 18 '19 at 14:16